8 unnumbered pages, xxviii, 209, that is, 210 pages, 2 unnumbered pages, 279-572, that is, 505 pages, 12 pages, 15 unnumbered leaves of plates, 5 unnumbered folded : 33 cm (folio)

Errors in paging: p. 149, 209, 210 and 380 numbered 194, 201, 209 and 179 respectively.--Pp. 211-276 omitted in pagination.--Note at foot of p. 209 [i.e. 210]: "That two presses being employed in printing these tracts, has caused a chasme in these pages"--Foliation of plates is also irregular: Plates I-III followed by Tab. I-XIII; Tab. II-III of second sequence are on same leaf

Dedication: To Sir Isaac Newton

Contents on t.p.: I. The present deficiency of natural philosophy ... with the methods of rendering it more certain and beneficial.--II. The nature, motion and effects of light ...III. An hypothetical explication of memory; how the organs made use of by the mind in its operation may be mechanically understood.--IV. An hypothesis and explication of the cause of gravity ...--V. Discourses of earthquakes ...VI. Lectures for improving navigation and astronomy

Index: p. [573-583]

Errata: p. [583]

Publishers' advertisements: p. [584]

[1]. The life of Dr. Robert Hooke.--[2]. A general scheme, or idea of the present state of natural philosophy ...--[3]. Lectures of light ...--[4]. A discourse of the nature of comets ...--[5]. Of gravity [a fragment].--[6]. Of magnetism [a fragment].--[7]. This discourse gives an explication of a glade of light first observed in the heavens by Dr. Childrey.--[9]. of Dr. Dee's book of spirits.--[10]. Lectures and discourses of earthquakes ...[11]. Lectures concerning navigation and astronomy

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